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I got a question just tried bleeding my cooling system seems like it ain't working like it used to I have the controls with the digital readouts in dash what reading in controls should I start feeling heat I only start to feel it at like 80-83 when go down to 70-75 feel cool it wasn't like that before any ideas I have the 4.0 engine and sometimes when change from heat on vent to go to defroster it goes cold when going from the vent to defroster could it be in the controls? Any help would be great thanks
 

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I always jack up the front end of the car as much as safely possible, or at least park it on a steep uphill. Set heater to the highest heat setting and run the engine at approximately 3000 RPM for about 10-15 minutes or until hot air is coming out of the vents.
 
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